Those in control of "this technology" cannot overrun the technical limitations of the sensors that have been sent into orbit. Of the currently available optical imaging satellites for the general public (research, public and private sector), the highest resolutions are from QuickBird-2 and GeoEye satellites, both available in GoogleEarth/Maps. QuickBird-2 has a resolution of around 0.6m in panchromatic ("greyscale") and 2.4m in multispectral (red, green, blue and near-infrared channels). Recently this resolution has been overtaken by GeoEye satellite : 0.5m panchromatic, 2m in multispectral. An even finer resolution on GeoEye (0.41m/1.65m) is not available for commercial purposes, i.e. it is only for US government. GoogleEarth/Maps also has aerial images in some locations, which have usually even finer resolution than the finest satellites.tuulen wrote:That same satellite technology apparently extends to virtually every place on all of planet Earth, everywhere, and perhaps those in control of that technology could also delete any pixillation. Indeed, just how fine of a resolution could such technology produce?Rob A. wrote:Finally!!.......I had read sometime ago that it would be coming to Finland in 2010.....and it looks to me like they haven't been fooling around....the coverage is excellent and very extensive.....
In practice, data from such very high resolution satellites is not acquired continuously over the whole Earth, but on an order-basis from customers for various applications. This archived data can then be available on GoogleEarth/GoogleMaps for visualisation purposes - Google orders the images they are interested in from archives, I guess they also place orders themselves for new imagery. But technically it is not possible to acquired the whole Earth continuously from these very high resolution satellites - because of e.g. limitations in data transfer rate back to Earth vs data size. Some satellites at lower spatial resolution are designed to handle a continuous coverage. To give you an idea, recently DigitalGlobe had extra acquisitions of QuickBird images over Haiti to cover the post-earthquake situation and made this data freely available. One QuickBird image is 16x16km, summing up to about 1 Gb only for the panchromatic channel. Around 800 Gb of data in total.GeoEye wrote:While GeoEye-1 can collect imagery at 0.41-meter ground resolutions, the Company’s operating license from the U.S. Government requires re-sampling the imagery to 0.5-meter for all customers not explicitly granted a waiver by the U.S. Government. Under current licensing constraints, only the U.S. Government would be allowed access to imagery at this highest resolution.
The military has even more expensive and fancy toys, but by definition only them know exactly what they have, we (outsiders) can only specualte about it. However even they cannot get around physical limitations, e.g. with regards to orbits and spatial resolution.
Actually there has been studies on using satellite data to detect illegal activities, including illegal wood cutting, oil spills, pot farming...etc... For example this study or that one (using hyperspectral data, usually lower spatial resolution but much higher spectral resolution, which is useful for distinguishing crop types).This could bring an end to pot farming!